We had similar feature in WiFi debugging in bug 806611. Ability to turn on debug messages in runtime can be handy for testing, but we still don't want to allow this through Gaia/Settings. We should instead have a default disabled preference like "ril.debugging.enabled" here.

(In reply to Shian-Yow Wu from comment #7)
> Comment on attachment 681421[details][diff][review]
> Bug_811605_patch_V2
>
> Review of attachment 681421[details][diff][review]:
> -----------------------------------------------------------------
>
> This is very useful for RIL debugging, asking approval to check into
> mozilla-aurora.
>
> A similar runtime debugging support for Wifi also checked in to
> mozilla-aurora(bug 806611).
Approving for Aurora assuming this will not have any major perf hits for non-debug users.